Novel transgenic mice for inducible gene overexpression in pancreatic cells define glucocorticoid receptor-mediated regulations of beta cells.

Novel transgenic mice for inducible gene overexpression in pancreatic cells define glucocorticoid receptor-mediated regulations of beta cells.
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DOI:
10.1371/journal.pone.0030210
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Tronche F
Tronche F
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Blondeau B;Sahly I;Massouridès E;Singh-Estivalet A;Valtat B;Dorchene D;Jaisser F;Bréant B;Tronche F

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特定细胞群中的条件性基因缺失有助于了解胰腺发育。使用这种方法,我们已经表明,删除胰腺前体细胞中的糖皮质激素受体(GR)基因会导致β细胞质量加倍。在这里,我们提供了遗传工具,允许使用四环素诱导系统的胰腺细胞中的靶基因的时空控制的表达。为了有效靶向特定细胞群中的四环素反式激活因子(tTA),我们在表达转录因子Pdx 1(BAC-Pdx 1-itTA)的胰腺祖细胞或表达胰岛素1基因(BAC-Ins 1-itTA)的β细胞中产生了表达改进的四环素反式激活因子(itTA)的细菌人工染色体(BAC)转基因小鼠。在两种转基因模型中,itTA介导的报告基因的激活是有效的,并受到多西环素(Dox)的调节。对四环素调节的LacZ报告基因的分析表明,在BAC-Pdx 1-itTA小鼠中,itTA从胚胎(E)第11.5天开始在所有胰腺前体细胞中表达。在成年胰腺中,itTA在成熟的β、δ细胞和少数腺泡细胞中具有活性。在BAC-Ins 1-itTA小鼠中,tTA从E13.5开始具有活性,并仅限于胎儿和成人胰腺中的β细胞。在这两种细胞系中,tTA活性被Dox处理抑制,并在Dox去除后重新诱导。使用这些转基因株系,我们在选择性胰腺细胞群中过表达GR,发现前体细胞中的过表达改变了成人β细胞分数,但不改变葡萄糖耐量。与此相反,GR在成熟β细胞中的过度表达并不改变β细胞的比例,但葡萄糖耐量受损,胰岛素分泌不足。总之,这些新的itTA小鼠模型将允许微调基因表达,以研究胰腺生物学中的基因功能,并帮助我们了解糖皮质激素信号传导如何影响β细胞生物学的长期不同方面。
Conditional gene deletion in specific cell populations has helped the understanding of pancreas development. Using this approach, we have shown that deleting the glucocorticoid receptor (GR) gene in pancreatic precursor cells leads to a doubled beta-cell mass. Here, we provide genetic tools that permit a temporally and spatially controlled expression of target genes in pancreatic cells using the Tetracycline inducible system. To efficiently target the Tetracycline transactivator (tTA) in specific cell populations, we generated Bacterial Artificial Chromosomes (BAC) transgenic mice expressing the improved Tetracycline transactivator (itTA) either in pancreatic progenitor cells expressing the transcription factor Pdx1 (BAC-Pdx1-itTA), or in beta cells expressing the insulin1 gene (BAC-Ins1-itTA). In the two transgenic models, itTA-mediated activation of reporter genes was efficient and subject to regulation by Doxycycline (Dox). The analysis of a tetracycline-regulated LacZ reporter gene shows that in BAC-Pdx1-itTA mice, itTA is expressed from embryonic (E) day 11.5 in all pancreatic precursor cells. In the adult pancreas, itTA is active in mature beta, delta cells and in few acinar cells. In BAC-Ins1-itTA mice tTA is active from E13.5 and is restricted to beta cells in fetal and adult pancreas. In both lines, tTA activity was suppressed by Dox treatment and re-induced after Dox removal. Using these transgenic lines, we overexpressed the GR in selective pancreatic cell populations and found that overexpression in precursor cells altered adult beta-cell fraction but not glucose tolerance. In contrast, GR overexpression in mature beta cells did not alter beta-cell fraction but impaired glucose tolerance with insufficient insulin secretion. In conclusion, these new itTA mouse models will allow fine-tuning of gene expression to investigate gene function in pancreatic biology and help us understand how glucocorticoid signaling affects on the long-term distinct aspects of beta-cell biology.
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发表时间: 1994-10-13
期刊: NATURE
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发表时间: 2001-09-01
影响因子: 5.1
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